11949871 has 4 divisors (see below), whose sum is σ = 12001392. Its totient is φ = 11898352.

The previous prime is 11949869. The next prime is 11949893. The reversal of 11949871 is 17894911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11949871 - 2¹ = 11949869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11949851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25411 + ... + 25876.

It is an arithmetic number, because the mean of its divisors is an integer number (3000348).

Almost surely, 2^11949871 is an apocalyptic number.

11949871 is a deficient number, since it is larger than the sum of its proper divisors (51521).

11949871 is an equidigital number, since it uses as much as digits as its factorization.

11949871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51520.

The product of its digits is 18144, while the sum is 40.

The square root of 11949871 is about 3456.8585449798. The cubic root of 11949871 is about 228.6236070052.

The spelling of 11949871 in words is "eleven million, nine hundred forty-nine thousand, eight hundred seventy-one".